[coreboot] [PATCH] Convert all Intel i810 boards to CAR

Joseph Smith joe at settoplinux.org
Wed Oct 13 15:50:52 CEST 2010

On 10/13/2010 01:24 AM, Warren Turkal wrote:
> On Tuesday 12 October 2010 19:22:43 Joseph Smith wrote:
>> FC-PGA's support SSE2 while the PGA's do not. that is the difference. I
>> created FC_PGA370 to make the CAR coversion simpler. Hope that helps.
> I must be misunderstanding this entirely.
> First, you say there is a difference in that the FC version support SSE2. Then,
> you say that the FC_PGA370 socket is simply a mechanism to make conversion to
> CAR easier.
> Does that mean that FC_PGA370 is simply PGA370 + CAR, or do PGA370 sockets
> really not support SSE2 chips?
> Researching it a little bit, I see that FC-PGA370 is a mechanically compatible
> socket, so I guess that the FC-PGA370 supports chips that the PGA370 does not.
> Is that correct? So FC-PGA is more than just an upgrade CAR?
Yes, socket wise they are backwars compatable in 99% of boards. The 
PGA's were 66MHz FSB Celerons with 128k L2 cache.

> So I guess I would be satisfied if I knew that the minimum size l2 cache for a
> chip that fits in the PGA370 was 4K since that's what the patch says and since
> that's really what matters for the DCACHE_RAM_SIZE.
> Also, are we sure that the DCACHE_RAM_BASE used will work? I.e. has it been
> tested on real hardware?
> Also, if we have real hardware running that works with this. Would if be
> possible to get a the register output for a cpuid 0x80000006 call? I'd just
> like to know if it would work on that processor since that call can be used to
> dynamically determine the amount of l2 cache. I've been thinking about adding
> that to the intel/amd/via CAR implementations so that DCACHE_RAM_SIZE doesn't
> need to be set.
I'm sure CAR will work on the PGA's, although they may need Keith's L2 
patch. More or less it was decided a while ago to split the model_6xx 
romcc clump-o-crap out into their own CAR model directories (starting 
with model_68x). I have a bunch of Socket 370 processors (FC-PGA and 
PGA) I plan on testing on my i810 board... I just have alot on my plate 
at this time.

Joseph Smith

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